/*
 * Created on 22 Jun 2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.networkmanager.impl.udp;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.gudy.azureus2.core3.util.AEThread;
import org.gudy.azureus2.core3.util.SystemTime;

public class NetworkGlueLoopBack implements NetworkGlue

{
    private int latency = 0;

    private NetworkGlueListener listener;

    private List message_queue = new ArrayList();

    private Random random = new Random();

    protected NetworkGlueLoopBack(NetworkGlueListener _listener) {
        listener = _listener;

        new AEThread("NetworkGlueLoopBack", true) {
            public void runSupport() {
                while (true) {

                    try {
                        Thread.sleep(1);

                    } catch (Throwable e) {

                    }

                    InetSocketAddress target_address = null;
                    InetSocketAddress source_address = null;
                    byte[] data = null;

                    long now = SystemTime.getCurrentTime();

                    synchronized (message_queue) {

                        if (message_queue.size() > 0) {

                            Object[] entry = (Object[]) message_queue.get(0);

                            if (((Long) entry[0]).longValue() < now) {

                                message_queue.remove(0);

                                source_address = (InetSocketAddress) entry[1];
                                target_address = (InetSocketAddress) entry[2];
                                data = (byte[]) entry[3];
                            }
                        }
                    }

                    if (source_address != null) {

                        listener.receive(target_address.getPort(), source_address, data, data.length);
                    }
                }
            }
        }.start();
    }

    public int send(int local_port, InetSocketAddress target, byte[] data)

    throws IOException {
        Long expires = new Long(SystemTime.getCurrentTime() + latency);

        InetSocketAddress local_address = new InetSocketAddress(target.getAddress(), local_port);

        synchronized (message_queue) {

            if (random.nextInt(4) != 9) {

                message_queue.add(new Object[] { expires, local_address, target, data });
            }
        }

        return (data.length);
    }

    public long[] getStats() {
        return (new long[] { 0, 0, 0, 0 });
    }
}
